Aruba Networks Version 3.3 manual User Mobility and Mobility Domains, VLANs 10, 20, 30

Aruba’s VLAN Pooling feature allows a set of VLANs to be assigned to a designated group of users. These VLANs can be configured as a non-contiguous set, a contiguous range, or a combination of the two. As an example, the set could be VLAN numbers 10, 20, and 30. It could also be VLAN numbers 2 through 5. These methods can be combined to provide a set such as 3, 5, and 7 through 10. This flexibility allows you to assign users to VLANs that may already exist in the enterprise. VLAN pools are the Aruba recommended method for handling user VLANs any time two or more user VLANs exist within the network.

Mobility controller

VLANs 10, 20, 30, 40

The system works by placing users in one of the VLANs in the pool. VLAN placement is done using the user’s MAC address and running it through a hash algorithm. The output of this algorithm places the user into one of the VLANs in the pool and ensures that the user is always placed into the same pool during a roaming event. As the user associates with the next AP, their address is hashed. They are then placed into the same VLAN on the new AP and can continue to use their existing IP address with no break in their user sessions.

User Mobility and Mobility Domains

ArubaOS provides seamless wireless connectivity as users move throughout the network through its Mobile IP service. With roaming cutover times of 2-3 milliseconds, delay-sensitive and persistent applications such as voice and video experience uninterrupted performance. ArubaOS integrates proxy Mobile IP and proxy DHCP functions letting users roam between subnets, APs and controllers without special client software bringing IP mobility to any IP based Wi-Fi®device. The Mobile IP system is the only system that can scale once the system moves beyond a few controllers, as Layer 2 VLAN roaming will be far too cumbersome.

Campus Wireless Networks Validated Reference Design Version 3.3 Design Guide Mobility Controller and Access Point Deployment 31